After discussions with the gentleman in charge of surface functionalization at INT last week, Jim suggested that I attempt to pretreat our membranes with 0.1% SDS before a filtration. The hope being that some surfactant left on the surface of the membrane would be enough to facilitate water passage through the membrane without wetting the…
A new user in URnano has used the “old” susceptor for a ~270 C (I might have the exact number wrong, but it is relatively low temp) to heat In on GaAs. I don’t think there was ever a good reason for using the RTP for this process, but what is done is done. I…
Karl and I have been working to measure separations using SEPCONs with particles ranging in size from 20 nm to 1 µm. We started out naively enough by slightly diluting some flourospheres we found in the refrigerator, putting them in the TECAN’s nanoquant plate and pressing run. I know. Ha ha. The first point we should…
Wafer # 4369 (PFI 02) was fabricated with pore sizes ranging from ~550 – 600 nm. Below are two SEM images of the pores, followed by two STEM images. The pores are all open and very well defined. The only defect I could find was a slight stitching offset in the patterning as seen the…
Following is a written protocol for SEPCON assembly. (Here is a link to a video demonstration) Materials required: wafer tweezers, small sample tweezers (preferably plastic), soft foam board from craft store, wafer of sepcon chips, razor blade, plastic enclosure to store complete SEPCON, top basket, bottom basket, 300 µm thick silicone sheet of pre-cut “U”…
SEPCON assembly
Using a 6″ wafer, we start with 50 nm of RV SiN, then deposit 40 nm a-Si followed by 20 nm of SiO2. RTP of 1050 C, 100 C/s, 60s. JP patterned the wafer to make standard SEPCON chips. The pores were transferred to the SiN using RIE. The RIE etches faster at the perimeter…
We created a 25-40-25 OSO stack with a SEPCON pattern. RTP at 1050 C 100 C/s 60 s. The following images show a comparison between the STEM detector and the SEM detector, and then a couple more images at 100 kx and 50 kx. I calculated a porosity of ~6.5 %, and…
Let’s get a blast-from-the-past and go through a bunch of drawers in the lab! I spoke with Jim and it seems like it might be best to schedule it during next regularly slotted Tuesday NRG mtg. So let’s plan on meeting downstairs in the lab on 2-19 at 9:45 am. Also, I bought an assortment…